Acacia bark (Acacia crassicarpa sp) contains cellulose, lignin and tannin which have the potential to be used as adsorbents in the form of charcoal. Acacia bark charcoal is used as an adsorbent in the adsorption of lead(II) ions. This research aims to determine the adsorption capacity and efficiency of acacia bark charcoal in adsorbing lead(II) ions with optimization conditions of pH, contact t…